Why does it print null when I parse JSON?

Question

Java

I parse the site's API https://api.qrfinex.com/v1.1/actions
like this json looks like

I get data like this

public static void main(String[] args) throws ParserConfigurationException, IOException, SAXException {
        ArrayList<String> xmlArrayList = new ArrayList<String>();

        URL url;
        URLConnection uc;
        StringBuilder parsedContentFromUrl = new StringBuilder();
        String urlString = "https://api.qrfinex.com/v1.1/actions";
        System.out.println("Getting content for URl : " + urlString);
        url = new URL(urlString);
        uc = url.openConnection();
        uc.connect();

        uc = url.openConnection();
        uc.addRequestProperty("User-Agent",
                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");


        uc.getInputStream();
        BufferedReader in = new BufferedReader(new InputStreamReader(uc.getInputStream(), "UTF-8"));
        int ch;

        while ((ch = in.read()) != -1) {
            parsedContentFromUrl.append((char) ch);
        }

        System.out.println(parsedContentFromUrl);
// получаем данные из сайта 

        //==========================================================================

// преобразуем полученные данные
        Gson gson = new Gson();

        RootObject response = gson.fromJson(String.valueOf(parsedContentFromUrl), RootObject.class);

        System.out.println(response.getActions());

And here are the classes that accept, but display null

public class Provider {
    private int id;
    private String name;
    private String icon;
    private String web;
    private String ios;
    private String android;

    @JsonProperty("id")
    public int getId() {
        return id;
    }

    @JsonProperty("id")
    public void setId(int id) {
        this.id = id;
    }

    @JsonProperty("name")
    public String getName() {
        return name;
    }

    @JsonProperty("name")
    public void setName(String name) {
        this.name = name;
    }

    @JsonProperty("icon")
    public String getIcon() {
        return icon;
    }

    @JsonProperty("icon")
    public void setIcon(String icon) {
        this.icon = icon;
    }

    @JsonProperty("web")
    public String getWeb() {
        return web;
    }

    @JsonProperty("web")
    public void setWeb(String web) {
        this.web = web;
    }

    @JsonProperty("ios")
    public String getIos() {
        return ios;
    }

    @JsonProperty("ios")
    public void setIos(String ios) {
        this.ios = ios;
    }

    @JsonProperty("android")
    public String getAndroid() {
        return android;
    }

    @JsonProperty("android")
    public void setAndroid(String android) {
        this.android = android;
    }
}

public class RootObject {
    private Provider[] providers;
    private Actions actions;

    @JsonProperty("providers")
    public Provider[] getProviders() {
        return providers;
    }

    @JsonProperty("providers")
    public void setProviders(Provider[] providers) {
        this.providers = providers;
    }

    @JsonProperty("actions")
    public Actions getActions() {
        return actions;
    }

    @JsonProperty("actions")
    public void setActions(Actions actions) {
        this.actions = actions;
    }
}

Maybe I made the classes wrong?

Answer 1

inside the providers there is also a List Item, perhaps because of this it does not work